2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
24 static const char rcsid[] =
25 "@(#) $Header: /tcpdump/master/tcpdump/print-ether.c,v 1.65.4.1 2002/06/01 23:51:12 guy Exp $ (LBL)";
32 #include <sys/param.h>
34 #include <sys/socket.h>
36 #include <netinet/in.h>
41 #include "interface.h"
42 #include "addrtoname.h"
43 #include "ethertype.h"
47 const u_char *packetp;
48 const u_char *snapend;
51 ether_print(register const u_char *bp, u_int length)
53 register const struct ether_header *ep;
55 ep = (const struct ether_header *)bp;
57 (void)printf("%s %s %d: ",
58 etheraddr_string(ESRC(ep)),
59 etheraddr_string(EDST(ep)),
62 (void)printf("%s %s %s %d: ",
63 etheraddr_string(ESRC(ep)),
64 etheraddr_string(EDST(ep)),
65 etherproto_string(ep->ether_type),
70 * This is the top level routine of the printer. 'p' is the points
71 * to the ether header of the packet, 'h->tv' is the timestamp,
72 * 'h->length' is the length of the packet off the wire, and 'h->caplen'
73 * is the number of bytes actually captured.
76 ether_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
78 u_int caplen = h->caplen;
79 u_int length = h->len;
80 struct ether_header *ep;
82 u_short extracted_ethertype;
87 if (caplen < ETHER_HDRLEN) {
93 ether_print(p, length);
96 * Some printers want to get back at the ethernet addresses,
97 * and/or check that they're not walking off the end of the packet.
98 * Rather than pass them all the way down, we set these globals.
101 snapend = p + caplen;
103 length -= ETHER_HDRLEN;
104 caplen -= ETHER_HDRLEN;
105 ep = (struct ether_header *)p;
108 ether_type = ntohs(ep->ether_type);
111 * Is it (gag) an 802.3 encapsulation?
113 extracted_ethertype = 0;
114 if (ether_type <= ETHERMTU) {
115 /* Try to print the LLC-layer header & higher layers */
116 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep),
117 &extracted_ethertype) == 0) {
118 /* ether_type not known, print raw packet */
120 ether_print((u_char *)ep, length + ETHER_HDRLEN);
121 if (extracted_ethertype) {
123 etherproto_string(htons(extracted_ethertype)));
125 if (!xflag && !qflag)
126 default_print(p, caplen);
128 } else if (ether_encap_print(ether_type, p, length, caplen,
129 &extracted_ethertype) == 0) {
130 /* ether_type not known, print raw packet */
132 ether_print((u_char *)ep, length + ETHER_HDRLEN);
133 if (!xflag && !qflag)
134 default_print(p, caplen);
137 default_print(p, caplen);
146 * Prints the packet encapsulated in an Ethernet data segment
147 * (or an equivalent encapsulation), given the Ethernet type code.
149 * Returns non-zero if it can do so, zero if the ethertype is unknown.
151 * The Ethernet type code is passed through a pointer; if it was
152 * ETHERTYPE_8021Q, it gets updated to be the Ethernet type of
153 * the 802.1Q payload, for the benefit of lower layers that might
154 * want to know what it is.
158 ether_encap_print(u_short ethertype, const u_char *p,
159 u_int length, u_int caplen, u_short *extracted_ethertype)
162 *extracted_ethertype = ethertype;
172 ip6_print(p, length);
177 case ETHERTYPE_REVARP:
178 arp_print(p, length, caplen);
182 decnet_print(p, length, caplen);
185 case ETHERTYPE_ATALK:
187 fputs("et1 ", stdout);
188 atalk_print(p, length);
192 aarp_print(p, length);
196 ipx_print(p, length);
199 case ETHERTYPE_8021Q:
200 printf("802.1Q vlan#%d P%d%s ",
201 ntohs(*(u_int16_t *)p) & 0xfff,
202 ntohs(*(u_int16_t *)p) >> 13,
203 (ntohs(*(u_int16_t *)p) & 0x1000) ? " CFI" : "");
204 ethertype = ntohs(*(u_int16_t *)(p + 2));
208 if (ethertype > ETHERMTU)
211 *extracted_ethertype = 0;
213 if (llc_print(p, length, caplen, p - 18, p - 12,
214 extracted_ethertype) == 0) {
215 /* ether_type not known, print raw packet */
217 ether_print(p - 18, length + 4);
218 if (*extracted_ethertype) {
220 etherproto_string(htons(*extracted_ethertype)));
222 if (!xflag && !qflag)
223 default_print(p - 18, caplen + 4);
227 case ETHERTYPE_PPPOED:
228 case ETHERTYPE_PPPOES:
229 case ETHERTYPE_PPPOED2:
230 case ETHERTYPE_PPPOES2:
231 pppoe_print(p, length);
238 ppp_print(p, length);
243 case ETHERTYPE_MPLS_MULTI:
244 mpls_print(p, length);
249 case ETHERTYPE_MOPRC:
250 case ETHERTYPE_MOPDL:
251 /* default_print for now */